Measurement of catalytic flue gas particle concentration
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As the title suggests: the particulate concentration in the flue gas of catalytic units is an important control parameter. Monitoring methods include online and offline types. 1. Online monitoring: Is it reliable for laser detectors to carry out measurements? 2. Offline monitoring: After sampling at a constant rate, how does the optical dust measurement device function (its principle)? 3. Advantages and disadvantages of the two monitoring methods
In terms of device usage, those that are in operation continuously tend to show inaccurate absolute values after half a year of use; however, the relative trends can still be used as a reference to determine whether there is an increase in leakage or similar issues； Sampling can be done offline; this method is used in many factories. After sampling, the material is dried and weighed, and by dividing this value by the weight of the flue gas that passed through during sampling, the dust content in the flue gas can be calculated. The collected dust is also used to analyze its particle size, to determine whether there are any large particles present.
The online failure rate is relatively high; in actual production, trends are generally monitored, and calibration is carried out frequently (the trend usually shows fluctuating increases that lead to exceeding the limit, or fluctuating decreases to 0, with straight lines appearing at times). Offline operation is more cumbersome, but it offers high reliability. It is generally measured at the beginning of construction. As an auxiliary means for online monitoring. The particle concentration at the inlet of our smoke extractor is no more than 150; it ranges from 60 to 120 during online monitoring, and from 60 to 80 during offline measurements